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Fiorelli, G.: Hummingbird unleashed (2013)
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Miller, C.C.: Google alters search to handle more complex queries (2013)
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Haynes, M.: Your Google algorithm cheat sheet : Panda, Penguin, and Hummingbird (2013)
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¬Der Google Hummingbird Algorithmus : semantisch-holistische Suche (2013)
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Kenney, A.R.; McGovern, N.Y.; Martinez, I.T.; Heidig, L.J.: Google meets eBay : what academic librarians can learn from alternative information providers (2003)
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